After the explosion of the Omega Star in 3048, space folded in on itself, and Earth turned inside out. Humanity became trapped within endless subterranean layers, where there is no sky—only stone, heat, and darkness. People built faction-cities: the immovable Yorzveteinhome, the wandering Tremarch, the radiant Ksarellit, and the living Nests. Each fights for air, warmth, and light, descending ever deeper into the places where the stone itself seems alive. Below dwell creatures of flesh and metal, and the walls whisper with the voices of the dead.

There is an ancient legend about the Vein of Yorz. When Yorz Blisht was dying, he said:

"I saw a river that flows not over stone, but through it. Its light is hot and cold at once. When we reach it, we will hear the sound of rain again."

Since then, people have believed that beneath the deepest rock flows a living current where matter becomes transparent and sings. It is said that if one drills a path to this Vein and connects it to the city, Yorzveteinhome will “awaken” and rise—not upward, but inward, to the place where the reverse sky begins.

Some claim the Vein is a remnant of the Omega Star, frozen in the world’s heart. Others whisper that it is the Earth’s own artery—and if it is ever opened, everything that lives in the Subsurface will spill out... into a place where there is no light at all.

“Deeper means closer to salvation.”

The oldest and largest city — a half-forgotten republic of engineers ruled by the Council of Heat. They control the energy of the magma fissures and believe that humanity’s rebirth lies in drilling ever deeper, toward the heart of the world.

Symbol: a drill fused into an eye of light.

They see all other cities as “strayed children,” and their technologies as blasphemy.

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"Only the moving shall survive.”

A nomadic city.

Mounted on colossal drilling wheels, it moves through the side tunnels, crushing everything in its path.

Tremarch is the only city capable of true movement. Its body is built from the remains of underground trains, machines, and drones of the old world.

They do not create — they consume.

Tremarch hunts other settlements, dismantling them alive and using their resources to keep moving.

“Better to be the hunter than the ore.”

Enemies: Yorzveteinholm and all stationary cities.

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“We are what remains of humanity.”

Degenerated mutant colonies.

They are not cities — but they cannot be ignored.

The Nests are colonies of former humans infected by living stone. They no longer remember speech, yet retain the instincts of engineers, building organic structures fused into the rock.

Some believe they are the closest to the Vein of Yorz — because they have become part of it.